Uninstalling a dual boot

I (for some unknown reason) unintentionally installed XP Professional twice on the same pc. I noticed this after trying to install MicroSoft Works suite 2003 and it told me i had no space on my D drive. In an attempt to fix this problem (space) Having lost my XP install disc, i came about a XP home edition disc, thinking this would overwrite my exsisting problem. In the installation i repartitioned my D drive giving me back the space i had lost. now i am stuck with XP Pro. (1 version) and XPHome ( 1 version) i would like to uninstall the home version and cannot figure out how please help me NitePrincess 31 in Maryland